CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Drag Coeffient monitor very high

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   December 1, 2012, 17:09
Default Drag Coeffient monitor very high
New Member
Join Date: Dec 2012
Posts: 3
Rep Power: 13
dwilson is on a distinguished road
I am modeling a NACA 0012 in 2D. I have drawn the aerofoil and the freestream box in NX and imported the CAD in. I then set everything up and I have set up two monitors for Cl and Cd in order to compare them to experimental data.

The Cl I have is around 1.2 which is a little high but the Cd i have is -3 and should be around 0.2. I have no idea why this is. I have set the reference values correctly I think in the monitor section (1.177 for density ref pressure is 101325 velocity is 6.943 force option is pressure +shear and the direction is set to components 0.9848,0.1736,0 as the aerofoil is simulated to be at 10 degrees. I have been looking for ages as to why the drag might be so high as I cant see anything wrong.

any throughts?
dwilson is offline   Reply With Quote

Old   December 4, 2012, 22:14
Join Date: Aug 2009
Posts: 92
Rep Power: 16
nomad is on a distinguished road
You should resolve forces in the streamwise(drag) and normal(lift) directions since your freestream is at an alpha.
nomad is offline   Reply With Quote

Old   December 21, 2012, 05:56
New Member
Niaz Ali Ahmed
Join Date: Jun 2010
Posts: 14
Rep Power: 15
niazaliahmed is on a distinguished road
Hi try choosing Standard K-Epsilon Low Re with adequate mesh resolution near the wall...
niazaliahmed is offline   Reply With Quote


coefficient, drag, monitor, naca 0012

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
drag coeff to high - kOmegaSST turbulence model RugbyGandalf OpenFOAM 5 February 22, 2011 03:35
high amount of drag coefficient. about 15????Is it okay? ndabir CFX 3 February 1, 2010 18:10
High drag coeff. estimated by Gambit+fluent M. suuri FLUENT 6 November 6, 2006 09:02
high drag value sulfi FLUENT 1 April 8, 2005 20:27
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12

All times are GMT -4. The time now is 10:35.